I've had my Elemental Designs system setup for about 6 months now and I couldn't be happier:
As you can see, I'm running the 6T6 towers up front with the T5T MTM center(6T6 wasn't available when I ordered). 5TC's are doing the side surround duty and 5T5 MTM's are doing rear surround work, mounted horizontally. An A3-300 with 'O' driver is doing the heavy lifting down low. The room measures 22x11x9(2200 sq ft) with the left side opening up to the rest of the house and the speakers fill the space expertly, going louder than I want to play them with an Onkyo 605(90 watts per channel).
The system images great, totally immersing me in the movies. Music sounds great too.
One of my big concerns with purchasing my system from a relatively new Internet based company was with customer service. Would they leave me stranded once they had my money? Well, not in my experience. I just had and issue with the subwoofer that turned out being the $175 plate Amp. Some minor troubleshooting and a quick call got me a new Amp right away, under warranty.
A word about the A3-300 'K' vs. 'O' driver. I started with the K and upgraded to the O. Having heard both, it really is a no brainer. Both filled the room well, but in my system the O driver goes deeper easier(I had stuff rattling that weren't before at the same volume levels). I know alot of people are going to the A5, but I don't feel I need any more for the size room I have.
Dollar for dollar, the performance Elemental Designs' system is unbeatable in my mind. And when you take into consideration that you get a package discount and free shipping on these heavy beasties, the decision just becomes easier.